file = input("File name: ").strip().lower()

extension_image = (".gif",".jpg", ".jpeg",".png")
extension_application = (".pdf","zip")
extension_text = ("txt")

condition_image = file.endswith(extension_image)
condition_application = file.endswith(extension_application)
condition_text = file.endswith(extension_text)

if condition_image == True:
    normal = file.split(".")
    print("image/" + str(normal[-1]))
elif condition_application == True:
    normal = file.split(".")
    print("application/" + str(normal[-1]))
elif condition_text == True:
    normal = file.split(".")
    print("text/" + str(normal[-1]))
else:
    print("application/octet-stream")

File take as an input the name and the extension and i should replace the extension like (.pdf) with the type of fyle slash the extension.